<template>
   <div class="app-container">
        <!-- <h1>这是 App 组件</h1> -->

      
         <!-- 顶部 Header 区域 -->
         <mt-header fixed title="Vue项目">
               <span  slot="left" @click="goBack" v-show="flag">
                  <mt-button icon="back">返回</mt-button>
               </span>
         </mt-header>

         <!-- 中间的 路由 router-view 区域 -->
         <transition>
            <router-view></router-view>
         </transition>
         
         <!-- 底部 Tabbar 区域 -->
          <nav class="mui-bar mui-bar-tab">
			<router-link class="mui-tab-item-llb" to="/home">
				<span class="mui-icon mui-icon-home"></span>
				<span class="mui-tab-label">首页</span>
			</router-link>
			<router-link class="mui-tab-item-llb" to="/member">
				<span class="mui-icon mui-icon-contact"></span>
				<span class="mui-tab-label">会员</span>
			</router-link>
			<router-link class="mui-tab-item-llb" to="/shopcar">
				<span class="mui-icon mui-icon-extra mui-icon-extra-cart">
					<span class="mui-badge" id="badge">{{ $store.getters.getAllCount }}</span>
				</span>
				<span class="mui-tab-label">购物车</span>
			</router-link>
			<router-link class="mui-tab-item-llb" to="/search">
				<span class="mui-icon mui-icon-search"></span>
				<span class="mui-tab-label">搜索</span>
			</router-link>
		</nav>




    

   </div>
</template>
<script>
      export default {

         data(){
            return {
                flag: false    //默认首页不显示
            }
         },
         created(){
            //页面刷新或者刚进入时不会触发watch，比如当你在购物车页面刷新页面就不会显示返回，所以只要一进入页面就得判断下
            this.flag = this.$route.path == "/home"?false: true
         },
         methods: {
            goBack(){
               this.$router.go(-1) //点击后退一步
            }
         },
         watch: {
            //监视路由地址的变化
            "$route.path" : function(newval,oldval){
               //如果当期的这个路由是首页/home,就不显示
               if(newval == "/home"){
                  this.flag = false;
               }
               else {
                  this.flag = true
               }
            }



         }




      }



        
</script>
<style lang="scss" scoped>
   .mint-header {
      z-index: 99;
   }
   .app-container {
      padding-top: 40px;
      padding-bottom: 50px;
      /*为了看不到切换动画效果*/
      overflow-x: hidden;
   }
      .v-enter{
         opacity: 0;
         transform: translateX(100%);
      }
      .v-leave-to {
         opacity: 0;
         transform: translateX(-100%);
         /*这行是为了让切换的区域没有上下效果*/
         position: absolute;
      }


      .v-enter-active,.v-leave-active{
         transition: all 0.8s ease;
      }


      //解决图文列表的坑不能进行tabber切换
    .mui-bar-tab .mui-tab-item-llb.mui-active {
    color: #007aff;
}

.mui-bar-tab .mui-tab-item-llb {
    display: table-cell;
    overflow: hidden;
    width: 1%;
    height: 50px;
    text-align: center;
    vertical-align: middle;
    white-space: nowrap;
    text-overflow: ellipsis;
    color: #929292;
}

.mui-bar-tab .mui-tab-item-llb .mui-icon {
    top: 3px;
    width: 24px;
    height: 24px;
    padding-top: 0;
    padding-bottom: 0;
}

.mui-bar-tab .mui-tab-item-llb .mui-icon~.mui-tab-label {
    font-size: 11px;
    display: block;
    overflow: hidden;
    text-overflow: ellipsis;
}


   
</style>